US7413277B2 - Method for controlling nozzle position in image forming apparatus - Google Patents
Method for controlling nozzle position in image forming apparatus Download PDFInfo
- Publication number
- US7413277B2 US7413277B2 US10/998,933 US99893304A US7413277B2 US 7413277 B2 US7413277 B2 US 7413277B2 US 99893304 A US99893304 A US 99893304A US 7413277 B2 US7413277 B2 US 7413277B2
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- US
- United States
- Prior art keywords
- test pattern
- positional information
- print medium
- detection sensor
- controlling
- Prior art date
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- Expired - Fee Related, expires
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
Definitions
- the present invention relates to a method for controlling the nozzle position in an ink-jet type image forming apparatus comprising nozzles for printing an image. More particularly, the present invention relates to a method for controlling the position of nozzles which move in relation to a print medium at the time of print-driving the image forming apparatus.
- image forming apparatus print an image on a print medium in response to print data input thereto, and, according to the type of printing, are classified into an ink-jet type which prints an image using an ink-jet process, and an electrophotographic type which prints an image using an electrophotographic process.
- ink-jet type image forming apparatus are those for printing images by directly ejecting ink onto a print medium, as found in an ink-jet printer and a plotter.
- an ink-jet type image forming apparatus 100 comprises a printing engine 130 for printing an image on a print medium P (see FIG. 2 ), a paper feeding device 120 for containing plural print mediums and for feeding the print mediums sheet by sheet while the image forming apparatus is print-driven, a paper transfer device with a plurality of rollers 151 and 153 , and a control section (not shown) for controlling the respective driving sections for the above-mentioned devices.
- the printing engine 130 comprises a reciprocating carriage 131 installed within a printer body 110 , one or more ink cartridges 133 for containing ink which are removably mounted in the carriage 131 , and one or more nozzle plates 135 (see FIG.
- Each nozzle plate 135 is provided with a plurality of nozzles (not shown) for ejecting ink.
- an image forming apparatus for printing a multi-colored image may comprise a plurality of such cartridges and nozzle plates, wherein the number of cartridges and nozzle plates corresponds to the number of colors required for printing such an image.
- a nozzle plate 135 may be formed integral with an ink cartridge 133 as shown in FIG. 2 , or integral with a carriage 131 , although not shown in the drawings.
- Symbols S and B which are not specifically described herein, respectively designate a guide shaft S and a belt B for guiding the movement of the carriage 131 .
- the image forming apparatus 100 configured as described above further comprises a detection sensor 137 for detecting an edge PE of a print medium at the time of print-driving as shown in FIG. 2 .
- the detection sensor 137 is used for determining a size of a print medium, determining a blank space in a print medium corresponding to a size of an image to be printed, and controlling a nozzle position in relation to a print medium.
- an optical detection sensor is generally used, which comprises a light source (not shown) and a light receiving part (not shown).
- the positional information detected as described above is provided by the detection sensor 137 with respect to an edge PE of a print medium. Accordingly, the distances D 1 and D 2 of the detection sensor 137 from the nozzle plates 135 , which are preset at the time of fabricating an image forming apparatus, are set as reference information, and the positions of the nozzles in relation to a print medium P are then monitored by combining the positional information of the detection sensor 137 measured in relation to the print medium P, and the reference information.
- a need exists for a method to control nozzle position in relation to a print medium which can further compensate for variations, such as manufacturing tolerances, the replacement of articles of consumption such as ink cartridges, and any changes in operating circumstances of the image forming apparatus, to thereby prevent the quality of images from being deteriorated.
- An object of the present invention is to provide a method for controlling the position of nozzles in an image forming apparatus, which enables positional information of a detection sensor, which provides reference information for controlling the position of the nozzles in the process of printing an image, to be accurately set in accordance with various circumstances and which also enables the positional information of the detection sensor to be corrected as needed.
- a method for controlling a nozzle position in an image forming apparatus.
- the apparatus comprises a nozzle plate provided with a plurality of nozzles and an optical detection sensor located adjacent to the nozzle plate, wherein positional information for the nozzles moving at the time of print-driving the image forming apparatus is calculated.
- the positional information is calculated by combining a first positional information with a second positional information.
- the first positional information comprises information regarding an effective detection area measured with reference to the nozzle plate and which is then recorded as a reference information from among various positional information for the effective detection area, wherein the effective detection area is defined as a detected area on a print medium measured by a light receiving part of the detection sensor in terms of the amount of reflected light.
- the second positional information for the effective detection area is measured with reference to a predetermined position of the print medium at the time of print-driving.
- the second positional information is variable depending on the movement of the nozzle plate and is preferably measured with reference to an edge of the print medium, which moves in a position facing the nozzle plate while an image is printed.
- the embodiments of the present invention may further comprise a method for accurately setting the position of the nozzles through the steps of a) inputting a predetermined test pattern on the print medium, b) measuring a distance from the effective detection area at the time of starting the printing of the test pattern to the test pattern along a first coordinate axial direction, c) measuring a distance from the effective detection area at the time of printing the test pattern to the test pattern along a second coordinate axial direction, d) calculating positional information on an orthogonal coordinate system consisting of the first and second coordinate axes by combining the distances measured in steps b) and c), and e) recording the positional information calculated in step d) as the first positional information, whereby the first positional information is set.
- the distances measured through the afore-mentioned steps are moving or travel distances of the detection sensor until the amount of reflected light reaches a predetermined level while the detection sensor is moved in relation to the print medium to measure the amount of reflected light.
- the resulting first positional information is relative positional information of the center of the effective detection area in relation to the center of the test pattern.
- the first positional information is calculated on the basis of first, second, third and fourth distances, wherein the first and third distances are individually measured from the edges which are the farthest from the effective detection area in the first and second coordinate axial directions to the center of the effective detection area, and wherein the second and fourth distances are the halves of the widths of the test pattern measured in the first and second coordinate axial directions, respectively.
- the method further comprises the steps of f) measuring the output signal output from the light receiving part while moving the detection sensor in relation to the test pattern from one side edge of the test pattern to the other side edge of the test pattern along the first and second coordinate axial directions, g) calculating the central position of the test pattern located between an output signal ascending area and an output signal descending area, h) setting the level of the output signal measured at a position spaced from the central position by second and fourth distances as a reference level, wherein the second and fourth distances correspond to halves of the preset widths of the test pattern measured in the first and second axial directions, respectively, i) returning the detection sensor to its initial position where the printing of the test pattern was started, and j) moving the detection sensor along the first and second coordinate axial directions to measure the first and third distances which are the distances from the initial position to the positions where the output signal arrives at the reference level, wherein the first positional information is calculated on the basis of each of the first and third distances measured in step
- the central position of the test pattern is preferably calculated by adding or subtracting the halves of the preset widths of the test pattern from the points which are positioned in the output signal ascending area and output signal descending area, respectively, at which the output signal has a same level in a corresponding coordinate axial direction, and of which the distances are substantially identical to the preset widths of the test pattern in the first and second coordinate axial directions, respectively.
- one of the first and second coordinate axial directions is parallel to the moving direction of the nozzle plate for printing the image, and the other is parallel to the moving direction of the print medium for printing the image.
- the detection sensor is fixed at a predetermined position and that the print medium is reciprocated in the print medium-discharging direction and the opposite direction in step c).
- test pattern is printed two or more times along the discharging direction of the print medium.
- test pattern is located and printed on the first and second axes extending from the center of the effective detection area, it is then preferable that the detection of the first and second distances be executed by moving the detection sensor in relation to the print medium from the initial position along the first and second coordinate axial directions.
- the detection sensor be moved in relation to the print medium from the initial position along the second coordinate axial direction so that the test pattern is positioned on the first coordinate axis, and that the detection sensor then measures the first distance while being moved in relation to the print medium in the first coordinate axial direction.
- the detection sensor be moved in relation to the print medium from the initial position along the first coordinate axial direction so that the test pattern is positioned on the second coordinate axis, and that the detection sensor then measures the second distance while being moved in relation to the print medium in the second coordinate axial direction.
- the distances between the centers of the effective detection area and the test pattern along the first and second coordinate axial directions be substantially identical to the distances between the centers of the effective detection area and the nozzle plate along the first and second coordinate axial directions, respectively.
- the image forming apparatus comprises plural nozzle plates, it is still further preferable that the first positional information for each nozzle plate be repeatedly set.
- FIG. 1 is a perspective view showing the interior of a conventional ink-jet printer
- FIG. 2 is a front view showing in detail a number of components of the ink-jet printer shown in FIG. 1 in order to describe a conventional method for controlling nozzle position;
- FIGS. 3A to 3F are sequential step-by-step views showing a method for controlling nozzle position according to a first embodiment of the present invention
- FIG. 4 is a graph showing a variation of an output signal of a detection sensor depending on the movement of the detection sensor according to the first embodiment of the present invention
- FIG. 5 is a view showing the initial positions of an effective detection area and a predetermined test pattern according to a second embodiment of the present invention.
- FIGS. 6A to 6C are sequential step-by-step views showing a method for controlling nozzle position according to a third embodiment of the present invention.
- FIG. 7 is a graph showing a variation of an output signal of the detection sensor depending on the movement of the detection sensor according to the third embodiment of the present invention.
- the control of a nozzle position in an image forming apparatus is executed on the basis of positional information calculated by setting a first positional information (X 4 , Y 4 ) (see FIG. 3A ), which is a relative positional information of a detection sensor 137 in relation to the nozzles, and then processing the first positional information along with a second positional information, which is a relative positional information of the detection sensor 137 measured on the basis of a print medium P (see FIG. 2 ) at the time of print-driving.
- the first positional information is obtained using an effective detection area A (see FIG.
- control section controls the paper feeding device 120 and the paper transferring device so that a print medium P is transferred and placed below a nozzle plate 135 as shown in FIG. 2 .
- the control section then controls the nozzle plate 135 so that a predetermined test pattern T as shown in FIG. 3A is printed on the print medium P.
- the center TC of the test pattern T, and the center Nc of the nozzle plate 135 are preferably coaxially arranged along the axis Z (see FIG. 2 ) normal to the print medium P.
- the distances from the center of the detection sensor 137 to the center of the nozzle plate 135 along the X and Y directions will be substantially the same as the distances from the center of the detection sensor 137 to the center of the test pattern T along the X and Y directions, respectively.
- the control section then controls the detection sensor 137 to illuminate light from the light source toward the print medium P, and then moves the carriage 131 (see FIG. 2 ) along a first axial direction X, which is the carriage moving direction at the time of print-driving the image forming apparatus. Accordingly, the detection sensor 137 is moved along with the carriage 131 , and consequently, the effective detection area A is also moved in the carriage moving direction. At this point, the light receiving part of the detection sensor 137 measures the amount of light reflected from the moving effective detection area A on the print medium P and outputs a signal corresponding to the measured amount of light.
- the signal is output as an electrical signal, wherein the electric voltage of the electrical signal becomes lowest when the effective detection area A is on the test pattern T as the detection sensor 137 moves, and becomes highest when the effective detection area A is positioned on an area where an image, such as the test pattern T, is not printed.
- FIG. 4 exemplifies how the output signal is varied in intensity depending on the moving distance of the effective detection area A as described above. For reference, it can be seen from FIG. 4 that the output signal is varied at areas ⁇ and ⁇ , which correspond to the edges of the test pattern T, respectively.
- the movement of the effective detection area A as described above is continued until reaching the edge E 1 of the test pattern T which is farthest from the first initial position P 1 in the first coordinate axial direction X.
- Such detection is effected using the intensity variation of the output signal of the light receiving part as described above.
- the control section calculates and records the relative moving distance X 1 of the effective detection area A along the first coordinate axial direction X.
- the control section measures the width X 2 of the test pattern T along the first coordinate axial direction X using the measuring process as described above but while moving the detection sensor 137 in the direction opposite to the first coordinate axial direction X shown in FIG. 3B .
- the width X 2 of the test pattern T measured in this embodiment is the moving distance between the positions where the output signal of the light receiving part has highest values, and wherein the measured width X 2 may be somewhat larger than the practical width of the test pattern T.
- the control section calculates the half value X 3 of the width X 2 of the test pattern T, and then subtracts the half value X 3 from the moving distance X 1 of the effective detection area A, thereby calculating a first distance X 4 (see FIG. 3A ), which is the distance from the center P 1 of the effective detection area A at the initial position, to the center TC of the test pattern T.
- the control section then records the first distance as a first coordinate value (X 4 , 0 ).
- the control section When the calculation of the first distance X 4 is completed, the control section then moves the carriage so that the effective detection area A is positioned at a second initial position P 2 on the test pattern as shown in FIG. 3D .
- the control section then controls the paper transfer device to move the print medium in the paper-discharging direction, that is, in the second coordinate axial direction Y perpendicular to the first coordinate axial direction X as shown in FIG. 3E .
- Such movement of the print medium is continued until an edge E 3 of the test pattern T is measured.
- the control section calculates the relative moving distance Y 1 of the effective detection area from the center of the effective detection area A positioned at the second initial position P 2 to the edge E 3 .
- this relative moving distance Y 1 of the effective detection area A is equal to the moving distance of the center TC of the test pattern, the moving distance of the center TC of the test pattern is illustrated rather than the relative moving distance of the effective detection area A in FIG. 3E providing a more clear illustration of the measurement.
- the movement of a print medium as described above may be employed if the image forming apparatus is an ink-jet printer.
- an image forming apparatus such as a plotter, in which a nozzle plate is capable of moving in the first and second coordinate axial directions, it is possible to acquire the same measurement results as those described above by directly moving the detection sensor 137 without moving the print medium.
- the control section then controls the paper transfer device to move the print medium in the direction opposite to the paper-discharging direction as shown in FIG. 3F to measure the width Y 2 of the test pattern T, and then determine the half value Y 3 of the width Y 2 of the test pattern.
- the control section subtracts the half value Y 3 from the moving distance Y 1 of the effective detection area A, thereby calculating a second distance Y 4 (see FIG. 3A ), which is the distance from the center of the effective detection area A positioned at the second initial position P 2 , to the center TC of the test pattern T.
- the control section then records the second distance Y 4 as a second coordinate value ( 0 , Y 4 ).
- a second coordinate value ( 0 , Y 4 ).
- the control section When the calculation of the first and second distances X 4 and Y 4 is completed as described above, the control section then combines the first and second coordinate values.
- the coordinate value obtained by combining the first and second coordinate values in this manner indicates a coordinate value calculated for the center P 1 position of the effective detection area A when positioned at the first initial position, relative to the center TC of the test pattern TC.
- This coordinate value is then recorded as a first positional information of the detection sensor 137 in relation to a nozzle plate 135 .
- the first positional information will be used as reference information for subsequently controlling the nozzle position.
- test pattern T that is printed at a position lying on the first coordinate axis X extending from the center of an effective detection area A, but spaced from the second coordinate axis Y as shown in FIG. 3A .
- the positions of the detection sensor 137 and the nozzle plate 135 may be varied from the positions described above.
- the test pattern T may be printed at a position spaced from the first coordinate axis X and lying on the second coordinate axis Y.
- the measurement can be performed in a substantially similar manner as described above.
- first positional information corresponding to various positions of the detection sensor 137 it is possible to measure first positional information corresponding to various positions of the detection sensor 137 . Moreover, substantially similar positional information can be obtained even where the measurement of the moving distances X 1 and Y 1 and the measurement of the widths of the test pattern X 2 and Y 2 are changed.
- a predetermined test pattern T is printed on a print medium as in the first embodiment.
- a signal output from a light receiving part is monitored while moving an effective detection area A along the first coordinate axis X.
- the movement of the effective detection area A is continued up to or beyond a side edge E 1 so that it is possible to measure at least the entire width of the test pattern T, although the movement may be varied depending on the initial position P 1 of the effective detection area A.
- the control section compares the preset width X 6 for the practical test pattern, with the measured result and then sets the level of the output signal corresponding to the width X 6 of the practical test pattern as a reference level V 1 .
- the effective detection area A is then moved to the first initial position P 1 which is the position at which the printing of the test pattern was started, and the detection sensor 137 is then moved along the first coordinate axis X until the output signal reaches at the reference level V 1 , wherein the moving distance X 8 is calculated.
- the distance between the center P 1 of the effective detection area A at the first initial position, and the center TC of the test pattern T is then calculated by summing the half value X 7 of the preset width X 6 of the test pattern and the moving distance X 8 , and this value is then recorded as the first distance X 4 .
- the detection sensor 137 is then moved along the first coordinate axis X so that the test pattern T is positioned on the second coordinate axis Y.
- the second distance Y 4 along the second coordinate axis is then calculated and recorded in a substantially similar manner as the first distance X 4 described above.
- the method for calculating the second distance Y 4 is substantially the same as that for calculating the first distance X 4 except that the moving direction of the effective detection area A is changed. Accordingly, a detailed description thereof is omitted.
- the method for setting the first positional information according to the third embodiment of the present invention can preferably be enabled only when the size of a predetermined test pattern is accurately known and set in advance.
- a predetermined test pattern in this embodiment is arranged so that the centers of the test pattern T and a nozzle plate 135 are coaxially positioned, and the test pattern T is printed in a size substantially equal with that of the nozzle plate 135 . If the test pattern T is formed having a shape symmetrical in every direction with reference to the center of the test pattern, few difficulties may exist. In such a case, however, it is often difficult to accurately set the practical size of the test pattern T. Therefore, it is preferable to print the test pattern T to conform to the preset size of the test pattern.
- the present invention it is possible to accurately set reference information required for controlling the nozzle position using a predetermined test pattern and an effective detection area, which is an area measured by the a detection sensor in terms of the amount of light reflected from the area.
- the present invention allows the renewal of such reference information to be executed as needed.
Abstract
Description
Claims (17)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR2003-87384 | 2003-12-03 | ||
KR1020030087384A KR100552460B1 (en) | 2003-12-03 | 2003-12-03 | Method for nozzle position controlling of image forming device |
Publications (2)
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US20050122365A1 US20050122365A1 (en) | 2005-06-09 |
US7413277B2 true US7413277B2 (en) | 2008-08-19 |
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US10/998,933 Expired - Fee Related US7413277B2 (en) | 2003-12-03 | 2004-11-30 | Method for controlling nozzle position in image forming apparatus |
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US (1) | US7413277B2 (en) |
KR (1) | KR100552460B1 (en) |
CN (1) | CN100371169C (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5423452B2 (en) * | 2010-02-08 | 2014-02-19 | 株式会社リコー | Recording apparatus and control method |
CN102616020B (en) * | 2012-04-01 | 2014-12-10 | 浙江大学 | Two-point positioning method and system used for large-format printing |
US9216603B1 (en) * | 2015-01-23 | 2015-12-22 | Xerox Corporation | System and method for generation of test patterns for measurement of printhead to substrate separation in a printer |
DE102016117211A1 (en) * | 2016-09-13 | 2018-03-15 | Schmid Rhyner Ag | Method and device for ink-jet application on flat substrates |
Citations (5)
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US5600350A (en) | 1993-04-30 | 1997-02-04 | Hewlett-Packard Company | Multiple inkjet print cartridge alignment by scanning a reference pattern and sampling same with reference to a position encoder |
EP1034936A2 (en) | 1999-03-05 | 2000-09-13 | Hewlett-Packard Company | Ink-jet test pattern |
US6302506B1 (en) | 1998-09-28 | 2001-10-16 | Hewlett-Packard Company | Apparatus and method for correcting carriage velocity induced ink drop positional errors |
US6428131B1 (en) | 1998-03-25 | 2002-08-06 | Sharp Kabushiki Kaisha | Image forming apparatus determining presence/absence of ink while moving ink cartridge |
US6450608B2 (en) | 1999-12-22 | 2002-09-17 | Hewlett-Packard Company | Method and apparatus for ink-jet drop trajectory and alignment error detection and correction |
Family Cites Families (7)
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US560350A (en) * | 1896-05-19 | Turbine water-wheel | ||
JPH04363277A (en) * | 1991-06-11 | 1992-12-16 | Tokyo Electric Co Ltd | Serial printer |
US5250956A (en) * | 1991-10-31 | 1993-10-05 | Hewlett-Packard Company | Print cartridge bidirectional alignment in carriage axis |
US5289208A (en) * | 1991-10-31 | 1994-02-22 | Hewlett-Packard Company | Automatic print cartridge alignment sensor system |
DE69307237T2 (en) * | 1992-09-25 | 1997-04-24 | Hewlett Packard Co | Procedure for aligning pens |
JPH1058765A (en) * | 1996-08-27 | 1998-03-03 | Hitachi Ltd | Information processor |
JP2001146051A (en) * | 1999-11-18 | 2001-05-29 | Canon Inc | Method for correcting feeding amount of recorder, and recorder |
-
2003
- 2003-12-03 KR KR1020030087384A patent/KR100552460B1/en not_active IP Right Cessation
-
2004
- 2004-11-30 US US10/998,933 patent/US7413277B2/en not_active Expired - Fee Related
- 2004-12-02 CN CNB2004100980699A patent/CN100371169C/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5600350A (en) | 1993-04-30 | 1997-02-04 | Hewlett-Packard Company | Multiple inkjet print cartridge alignment by scanning a reference pattern and sampling same with reference to a position encoder |
US6428131B1 (en) | 1998-03-25 | 2002-08-06 | Sharp Kabushiki Kaisha | Image forming apparatus determining presence/absence of ink while moving ink cartridge |
US6302506B1 (en) | 1998-09-28 | 2001-10-16 | Hewlett-Packard Company | Apparatus and method for correcting carriage velocity induced ink drop positional errors |
EP1034936A2 (en) | 1999-03-05 | 2000-09-13 | Hewlett-Packard Company | Ink-jet test pattern |
US6450608B2 (en) | 1999-12-22 | 2002-09-17 | Hewlett-Packard Company | Method and apparatus for ink-jet drop trajectory and alignment error detection and correction |
Also Published As
Publication number | Publication date |
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US20050122365A1 (en) | 2005-06-09 |
CN1623782A (en) | 2005-06-08 |
CN100371169C (en) | 2008-02-27 |
KR100552460B1 (en) | 2006-02-20 |
KR20050054090A (en) | 2005-06-10 |
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